PTA4 always ON

Cram — Tue, 04 Jun 2013 13:56:16 GMT

Dear all,

I'm using a S9S08QD4 and developing the code with codewarrior. I have abig problem with PTA4, it's alway ON.

Following this thread (https://community.freescale.com/thread/306908) about PTA4 and PTA5. Solved with bigmac contrbution, now I'm using a BSS131 to drive my relay. But now I'm facing a "problem" with PTA4, I can program and debug the code, but when I set the BKGPE to zero and start the normal operation the PTA4 goes HIGH and stays there. this is my init code for periphericals:

void periphInit (void){

              asm SEI;        //disable interrupt mask
              //I/O

              PTASE=0x00;     // No slew rate
              PTADS=0x00;     // no DS
              PTAPE=0x00;     // No pull-up

              PTAD=0x00;      // Sortides a 0
              PTADD=0x11;

              //RTI

              SRTISC=0x10;       //1kHz OSC intern amb time-out 1seg.

              // MTIM ( Base de Temps : 1,008ms)

              /* TPMSC: TOF=0,TOIE=0,CPWMS=0,CLKSB=0,CLKSA=0,PS2=0,PS1=0,PS0=0 */
              TPMSC = 0x00;                        /* Stop and reset counter */
              TPMMOD = 0x3E;                       /* Period value setting */
              (void)(TPMSC == 0);                  /* Overflow int. flag clearing (first part) */



              SOPT1 = 0x92;         //0x92 BKG 0X90 No BKG
              SOPT2 = 0x00;

              SPMSC1 = 0x00;
              SPMSC2 = 0x00;

              /* System clock initialization */

              ICSTRM = *(unsigned char*far)0xFFAF; /* Initialize ICSTRM register from a non volatile memory */
              ICSSC = *(unsigned char*far)0xFFAE; /* Initialize ICSSC register from a non volatile memory */


              /* Initialization of the ICS control register 1 */
              /* Initialization of the ICS control register 2 */
              ICSC1 = 0x06;                        /* ICSC1: CLKS=0,IREFSTEN=0 */
              ICSC2 = 0x00;                        /* ICSC2: BDIV=1,LP=0 */

              asm CLI; //interrupt on and return

              clrWD();

}

Just after power ON the system PTA4 goes HIGH and the relays switches ON and if I force it to goes LOW it stays HIGH, and I don't see why, What I'm making wrong? Any hint?

Br.

Marc

Re: PTA4 always ON

Cram — Fri, 07 Jun 2013 06:10:53 GMT

Well finally I found the problem. I was a tin ball under the microcontroller due to a bad PCB isolation process.

8-bit MicrocontrollersのトピックRe: PTA4 always ON

PTA4 always ON

Re: PTA4 always ON